Self-balancing double-wheeled electrical scooter

ABSTRACT

A self-balancing double-wheeled electrical scooter is provided with an assembly for controlling a travel direction of the self-balancing double-wheeled electrical scooter, wherein, the travel direction of the self-balancing double-wheeled electrical scooter is controlled via a handle, a resilient recoverable component is provided between a scooter body and the handle, the handle is adapted for driving the resilient recoverable component to control the travel direction of the scooter, the resilient recoverable component comprises a stator (101), a rotor (112) and a resilient recoverable unit (111), the rotor (112) is mechanically connected to the handle in a fixed manner directly or indirectly, the stator (101) is mechanically connected to the scooter body (107) in a fixed manner directly or indirectly, the stator (101) and the rotor (112) are connected in a resilient manner via the resilient recoverable unit, the resilient recoverable component further comprises an angle limiting device, the angle limiting device comprises a limiting cover (103) and a limiting pin (105), the limiting cover (103) is mechanically connected to the stator (101) in a fixed manner directly or indirectly, a limiting hole is provided on the limiting cover (103), the limiting pin (105) is mechanically connected to the rotor (112) in a fixed manner directly or indirectly, and the rotation of the rotor (112) causes the limiting pin (105) to rotate within a certain angle range inside the limiting hole on the limiting cover (103).

This Application is a US National stage of PCT/CN2015/089591 filed Sep.15, 2015, and claims priority to 201420526020.8 (CN), 201420525996.3(CN), 201420525841.X (CN), 201420525822.7 (CN), 201420525825.0 (CN), and201420525971.3 (CN), all of which were filed Sep. 15, 2014 and areincorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a self-balancing double-wheeledelectrical scooter, which pertains to the technical field of traffictools.

BACKGROUND

With the continuous development of society and economics, more and moretraffic tools emerge day by day, city roads become more and morecrowded, and the contradictions between road resource and motor vehicleamount become increasingly acute. For China with more than 1.3 billionpopulation, it is already unrealistic to make city roads adapt to ourtraffic tools, and the only way out is to make our traffic tools adaptto our roads. In the meantime, a series of environmental problems suchas ozone sphere holes and sea level rising are bothering us, and one ofthe important reasons that causes such conditions is motor vehicle tailgas emission. Therefore, we need an energy-saving, environmentalfriendly traffic tool that is able to move through crowds, in order tosolve these increasingly acute contradictions.

The self-balancing electrical scooter that begins to circulate on themarket nowadays is also called Segway, uses lithium cells as electricalpower source, is environmental friendly and energy-saving, and maybecome a new-generation traffic tool. Its operation principle is basedon “dynamic stability” to maintain vehicle balance in the runningdirection by automatic balancing ability of the electrical scooteritself. Generally, a gyroscope, i.e., a body-sensing balancing system,is provided inside the scooter body, real-time conditions of the scooterbody is sensed by the body-sensing balancing system so as to transmitthe information to an information processing system, and after thesensed information is processed by the information processing system, aproper instruction is computed and sent to a motor, thereby controllingthe motor to achieve a balance status of scooter body running, so that arider can control the acceleration and deceleration of the scooter bodyby moving his/her gravity center so as to achieve running balance.However, the self-balancing electrical scooters currently on the markethave the following problems:

1) The self-balancing electrical scooter senses running in thefront-back direction by the gyroscope, i.e., the body-sensing balancingsystem, but for running in the left-right direction, the self-balancingelectrical scooter controls its displacement by force exerted on itshandle, so the connection structure between the handle and the scooterbody directly influences control operation in the left-right directionof the scooter body;

2) The operation switch of the self-balancing electrical scooter isconfigured on the handle, the balancing system of the electrical scooteris not working before the scooter is turned on, and thus the scooter isin an unbalanced status, rendering the rider unable to stand on thescooter; the rider normally stand beside the scooter to turn on theswitch on the handle and exert a force on the handle, the force exertedon the handle generates an instruction for the scooter to run in thefront-back direction or in the left-right direction, and the scooterstarts to run, because such running is not controlled consciously by therider, the scooter probably would run into the rider, or it is difficultand dangerous for the rider to stand onto the moving scooter due torelative motion between the rider and the scooter;

3) The connection performance between the wheels and the scooter body ispoor, and there is a risk of the wheels detaching from the scooter body;

4) The handle of the self-balancing electrical scooter is not foldable,which wastes space and is not convenient to carry around;

5) The connection structure between the motor shaft and the wheels ofthe self-balancing electrical scooter is complicated and causes unstablerunning.

SUMMARY OF THE INVENTION

A first technical problem to be solved by the present invention is theconnection structure between the handle and the scooter body of theself-balancing electrical scooter in prior art directly influencescontrol operation in the left-right direction of the scooter body. Asecond technical problem to be solved by the present invention is thestarting-up of the self-balancing electrical scooter in prior art hascertain difficulty and a large risk. A third technical problem to besolved by the present invention is the connection performance betweenthe wheels and the scooter body of the self-balancing electrical scooterin prior art is poor and has a risk of the wheels detaching from thescooter body. A fourth technical problem to be solved by the presentinvention is the handle of the self-balancing electrical scooter inprior art is not foldable, which wastes space and is not convenient tocarry around. A fifth technical problem to be solved by the presentinvention is the connection structure between the motor shaft and thewheels of the self-balancing electrical scooter in prior art iscomplicated and causes unstable running.

In order to solve at least one of the above-mentioned technicalproblems, according to a first aspect of the present invention, theembodiments of the present invention disclose an assembly forcontrolling a travel direction of a self-balancing double-wheeledelectrical scooter, wherein, the travel direction of the self-balancingdouble-wheeled electrical scooter is controlled via a handle on ascooter body, a resilient recoverable component is provided between thescooter body and the handle, the handle is adapted for driving theresilient recoverable component to control the travel direction of thescooter, the resilient recoverable component comprises a stator, a rotorand a resilient recoverable unit, the rotor is mechanically connected tothe handle in a fixed manner directly or indirectly, the stator ismechanically connected to the scooter body in a fixed manner directly orindirectly, the stator and the rotor are connected in a resilient mannervia the resilient recoverable unit, which has a simple mechanism and iseasy to manufacture in an industrialized manner. When the handle movesunder external force, it drives the rotor to move by the same angle;when the external force disappears, the rotor returns to its originalstatus under an elastic recovery force of the resilient recoverable unitand in the meantime drives the handle to return to its original status,so that the controllability of direction turning of the electricalscooter is improved. The stator and rotor mentioned herein has nothingto do with a motor, the stator refers to a stationary part in theresilient recoverable component, the rotor refers to a part rotatablerelative to the stator in the resilient recoverable component, and therotor rotates around a center axis of the stator.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the stator is disposed inside therotor; or the rotor is disposed inside the stator. The resilientrecoverable unit is filled in the gap between the stator and the rotorso that the stator and the rotor are connected integrally via theresilient recoverable unit, the rotor driven by an external forcerotates relative to its initial position, causing the resilientrecoverable unit to deform, and when the external driving force exertedon the rotor weakens or disappears, the elastic recovery force of theresilient recoverable unit causes the rotor to move towards its initialposition or return to its initial position.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, a position limiting component isprovided between the stator and the rotor, for preventing all movementsof the rotor relative to the stator other than rotation.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the stator and the rotor areconnected in a resilient manner via the resilient recoverable unit, andthe resilient recoverable unit is a rubber unit or a silicone unit thatis injection molded between the stator and the rotor, for increasing thefastening strength between the resilient recoverable unit and the statoras well as the rotor.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, in order to increase the elasticrecovery property of the rubber unit to allow a rider to moreconveniently and comfortably control the handle with an optimum force,the ingredients of the rubber unit include 50%-65% by weight of rawrubber NR, 15%-25% by weight of carbon black N774, 7%-15% by weight ofcarbon black N330, 3%-9% by weight of naphthenic oil, 1%-5% by weight ofzinc oxide, 0.1%-0.5% by weight of antiager MB, 0.1%-0.5% by weight ofstearic acid, 0.1%-0.5% by weight of RD, 0.1%-0.5% by weight of WB212,0.1%-0.5% by weight of accelerant DM, and 0.5%-1.2% by weight ofaccelerant CZ.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the resilient recoverable unit in theresilient recoverable component is a rubber unit prepared by thefollowing manner: according to a feedstock total mass of 10 kg, rawrubber NR passes between two rollers on an open mill for 5 times under100□±2□ for a duration of 75-85 seconds, carbon black N774, carbon blackN330, naphthenic oil, zinc oxide, antiager MB, stearic acid, RD andWB212 are added for mixing under 110□±2□ for a duration of 110-130seconds, more naphthenic oil is added for mixing under 120□±2□ for aduration of 90-110 seconds with surface cleaning for a duration of150-170 seconds, after more than 8 hours of storing, accelerant DM,accelerant CZ and sulfur are added for mixing under 50□-60□ for aduration of 75-85 seconds, and the resultant is compressed into sheetsby rollers, thereby completing the rubber preparation.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, in order to increase the strippingstrength between the resilient recoverable unit and the stator as wellas the rotor, the contact surface between the stator and the resilientrecoverable unit or between the rotor and the resilient recoverable unitis a rough surface or a dented patterned surface.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the resilient recoverable componentbetween the scooter body and the handle further comprises an anglelimiting device which limits rotation of the rotor to a certain anglerange and correspondingly limits rotation of the handle to this anglerange.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the angle limiting device that limitsrotation of the rotor to a certain angle range comprises a limitingcover and a limiting pin, the limiting cover is mechanically connectedto the stator in a fixed manner directly or indirectly, a limiting holeis provided on the limiting cover, the limiting pin is mechanicallyconnected to the rotor in a fixed manner directly or indirectly, and therotation of the rotor causes the limiting pin to rotate within a certainangle range inside the limiting hole on the limiting cover.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the handle and the rotor aremechanically connected in a fixed manner via a handle base, the limitingpin is fixed on the handle base, and the handle, when driven by anexternal force, is adapted for driving the handle base and the limitingpin on the handle base to rotate within a certain angle range limited bythe limiting hole on the limiting cover.

In the assembly for controlling a travel direction of a self-balancingdouble-wheeled electrical scooter, the angle range that the rotation ofthe rotor is limited to and correspondingly the rotation of the handleis limited to is preferably from −30° to 30°. Rotation within such anangle range is comfortable for a rider to operate.

According to a second aspect of the present invention, the embodimentsof the present invention disclose a device for collecting information ofchange of handle position that is set on the assembly for controlling atravel direction of a self-balancing double-wheeled electrical scooter,wherein, the resilient recoverable component between the scooter bodyand the handle is further provided with the device for collectinginformation of change of handle position in order to capture instantinformation of change of the handle position when the scooter body makesa turn.

The device for collecting information of change of handle positioncomprises a signal capturing and processing unit and a signal emittingunit.

In the device for collecting information of change of handle position,the signal emitting unit is directly or indirectly fixed to the rotorwhich is mechanically connected to the handle in a fixed manner directlyor indirectly, the signal capturing and processing unit is directly orindirectly fixed to the stator which is mechanically connected to thescooter body in a fixed manner directly or indirectly, the rotation ofthe rotor relative to the stator drives the signal emitting unit torotate relative to the signal capturing and processing unit. The signalemitting unit emits different signals associated with its differentpositions relative to the signal capturing and processing unit duringits rotation process, the signal capturing and processing unit capturesand processes different signals and then transmits correspondinginformation to a control unit, the control unit processes and transmitscorresponding information to motors, and accordingly the motors drivethe two wheels differently.

In the device for collecting information of change of handle position,the signal emitting unit is directly or indirectly fixed to the statorwhich is mechanically connected to the scooter body in a fixed mannerdirectly or indirectly, the signal capturing and processing unit isdirectly or indirectly fixed to the rotor which is mechanicallyconnected to the handle in a fixed manner directly or indirectly, therotation of the rotor relative to the stator drives the signal capturingand processing unit to rotate relative to the signal emitting unit. Thesignal capturing and processing unit receives different signalsassociated with its different positions relative to the signal emittingunit during its rotation process, the signal capturing and processingunit captures and processes different signals and then transmitscorresponding information to a control unit, the control unit processesand transmits corresponding information to motors, and accordingly themotors drive the two wheels differently.

In the device for collecting information of change of handle position,the signal emitting unit is a magnet, and the signal capturing andprocessing unit is a linear Hall sensor. The linear Hall sensor capturesand processes information of change of the magnetic field caused bychange of position of the magnet which rotates relative to the linearHall sensor, and then transmits corresponding information to a controlunit, the control unit processes and transmits corresponding informationto motors, and accordingly the motors drive the two wheels differently.

In the device for collecting information of change of handle position,the magnet comprises a pair of magnets which are arranged in a centralsymmetric manner and are directly or indirectly mechanically fixed tothe stator or the rotor, with a center thereof being a rotation centerof the rotor, and the linear Hall sensor is fixed at a locationcorresponding to the center of the magnets. The linear Hall sensorcaptures and processes information of change of the magnetic fieldrelated to change of the rotation angle relative to the magnets, andthen transmits corresponding information to a control unit to computecontrol values for motors of the two wheels, the control unit transmitscorresponding information to motors, and accordingly the motors drivethe two wheels differently to produce a speed difference between the twowheels for making a turn.

According to a third aspect of the present invention, in order to reducethe risk level when a rider turns on a self-balancing double-wheeledelectrical scooter, the embodiments of the present invention disclose anassembly for turning on and turning off operation of a self-balancingdouble-wheeled electrical scooter, the assembly comprises a signalsensing device, a resilient unit and a signal blocking unit, the signalsensing device is set in a chassis of the self-balancing double-wheeledelectrical scooter under a foot pedal, the resilient unit is arrangedabove the signal sensing device and directly facing the signal sensingdevice, the signal blocking unit is connected to the resilient unit in afixed manner and is arranged under the resilient unit andperpendicularly corresponding to a signal transmission path of thesignal sensing device. This assembly is also called a gravity sensingassembly and is controlled by a foot of a rider. When a foot of therider is standing on the assembly for turning on and turning offoperation of the self-balancing double-wheeled electrical scooter, underthe action of gravity, the resilient unit deforms and causes the signalblocking unit to move vertically toward the signal transmission path andblock the sensing signal, and accordingly the operation system of theelectrical scooter is turned on. As the rider is already standing on thescooter when the scooter starts to run, the human body and the scooterbody can travel synchronously, thereby improving safety.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, the signal sensingdevice comprises a circuit board, as well as an optical signal emitter,an optical signal receiver, a signal transmission port, acurrent-limiting resistor, a filter capacitor, a load resistor which areall mounted on the circuit board.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, after electrical poweris filtered by the filter capacitor to eliminate any power impurityinterference and current-limited by the current-limiting resistor andthen fed to the optical signal emitter, the optical signal emitter isconfigured to send a sensing signal in the form of light to the opticalsignal receiver, the optical signal receiver is configured to convertthe received optical signal into electrical current signal which is thenconverted into voltage signal via the load resistor and transmitted tothe signal transmission port and after that sent to a controller of theself-balancing double-wheeled electrical scooter, and when thecontroller receives the voltage signal, the operation of theself-balancing double-wheeled electrical scooter is controlled at ashut-down state.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, the signal sensingdevice is set in the chassis of the self-balancing double-wheeledelectrical scooter, the foot pedal on the chassis is provided with anaperture which is correspondingly located above the signal transmissionpath of the signal sensing device, the resilient unit is arranged abovethe aperture of the foot pedal in a protruding manner, the signalblocking unit on the resilient unit is arranged to extend through theaperture, when the resilient unit is deformed downwards by an externalforce, the signal blocking unit is configured to block the sensingsignal of the signal sensing device.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, when the sensingsignal of the signal sensing device is blocked by the signal blockingunit, the optical signal sent by the optical signal emitter cannot betransmitted to the optical signal receiver, so that the controller ofthe self-balancing double-wheeled electrical scooter does not receiveany voltage signal from the signal sensing device, thereby the operationof the self-balancing double-wheeled electrical scooter is controlled atan actuated state.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, the resilient unit isfixed to the foot pedal in a sealed manner.

In the assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter, a foot pad is furtherprovided above the resilient unit on the foot pedal, when no downwardforce is exerted on the foot pad, i.e., when the foot of the rider doesnot tread on the foot pad, there is no action of interaction forcebetween the foot pad and the resilient unit or their interaction forceis not enough to deform the resilient unit, causing the operation of theself-balancing double-wheeled electrical scooter to be at a shut-downstate. When the foot of the rider treads on the foot pad, theinteraction force between the foot pad and the resilient unit deformsthe resilient unit, causing the sensing signal to be blocked and thusthe operation of the self-balancing double-wheeled electrical scooter tobe at an actuated state.

According to a fourth aspect of the present invention, the embodimentsof the present invention disclose a self-balancing double-wheeledelectrical scooter that comprises one or more of the aforementionedassembly for turning on and turning off operation of the self-balancingdouble-wheeled electrical scooter, wherein, when the sensing signal ofat least one signal sensing device is blocked by the signal blockingunit, the assembly for turning on and turning off operation of theself-balancing double-wheeled electrical scooter is turned on, and theoperation of the self-balancing double-wheeled electrical scooter entersan actuated state.

According to a fifth aspect of the present invention, the embodiments ofthe present invention disclose a fixed connection structure between awheel and a scooter body of a self-balancing double-wheeled electricalscooter, wherein, the wheels are mechanically fixed to the scooter bodythrough a respective axle, the scooter body is fixed to the axle bymeans of a fastening component and a flange nut screwed tightly on theaxle. Because the gasket and the nut of the flange nut are integrallyformed, with anti-slide teeth on the flange surface, the contact areabetween the nut and the work piece is increased, and as compared to acombination of an ordinary nut plus a gasket, the flange nut is firmerand has larger pulling force.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, besides the flangenut, the fastening component that fastens the axle to the scooter bodyfurther comprises a crescent unit, an adjusting steel sheet and an axlesleeve, wherein, the axle sleeve is made of material harder than thescooter body, and the scooter body is fixed to the axle sleeve bypressure casting so as to form an integral body; the axle is mounted inthe axle sleeve, and because the axle sleeve is made of hard material,the axle would not deform as a result of exerted force; in order toconnect the axle and the scooter body more firmly, an end of the axle isfurther fastened to the scooter body by the crescent unit, the adjustingsteel sheet and the flange nut.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the crescent unit ofthe fastening component that fastens the axle to the scooter body servesas a buffer between the axle sleeve and the flange nut, and effectivelyincreases the fastening strength of the flange nut. The flange nut isgenerally made of rigid material, preferably hardened by quenching.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the crescent unit ofthe fastening component that fastens the axle to the scooter bodycomprises two crescent pieces provided between the flange nut and theaxle sleeve, with concave portions of the two crescent pieces clamped onthe axle from opposite directions, and the adjusting steel sheet isfitted between the crescent unit and the scooter body. On one hand,because the surface of the scooter body is not smooth, by using thesteel sheet as a medium, the friction force between the crescent unitand the scooter body is reduced, and the flange nut is easy to beinserted due to the lubrication effect of the steel sheet; on the otherhand, by selecting a steel sheet with a suitable thickness according tothe gap size between the crescent unit and the scooter body, theintegral firmness is increased.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, a surface oppositethe concave portion of the crescent piece is a slanted surface whichskews towards the axle on a side near the wheel, and the surface withthe screw hole on the scooter body also has slanted portions. When theflange nut pushes the crescent pieces to screw toward the wheel, becausethe surface with the screw hole has slanted portions, the screw holebecomes smaller and smaller. The corresponding surface on the scooterbody skews towards the axle on a side near the wheel in a mannercorresponding to that of the crescent piece, and the adjusting steelsheet is fitted between the crescent unit and the scooter body.Therefore, during a continuous screwing-in process, the contact betweenthe flange nut and the crescent unit, between the crescent unit and theaxle, between the crescent unit and the adjusting steel sheet, as wellas between the adjusting steel sheet and the scooter body would becomemore and more firm.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the axle is providedwith a hole at a position behind the flange nut and adjacent the flangenut, the fastening component further comprises a split pin which is setin the hole of the axle. The split pin is configured to prevent theflange nut from being screwed out. By further providing a split pin onthe axle to secure the flange nut, the flange nut is prevented fromloosening, and screwing out of the flange nut is effectively prevented.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the scooter body isfixed to the axle sleeve by pressure casting. By using an axle sleevemade of material harder than the scooter body as a medium between theaxle and the scooter body, the weight bearing strength of the scooter isincreased.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the axle sleeve ispressed into the scooter body by means of an interference fit.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, the axle sleeve ofthe fastening component that fastens the axle to the scooter body isfixed to the scooter body by pressure casting. As the scooter body isfixed to the axle sleeve by pressure casting, an outer surface of theaxle sleeve contacts the scooter body in a fitted manner. The outersurface of the axle sleeve is rough or has dented portions thereon,which effectively increases the binding force to the scooter body. Bymachining the outer surface of the axle sleeve to be rough or dented,the stripping force in the horizontal direction required for strippingthe axle sleeve and the scooter body apart becomes larger, so that thefixing between the axle sleeve and the scooter body is firmer, therebyeffectively preventing the axle sleeve from detaching from the scooterbody.

In the fixed connection structure between a wheel and a scooter body ofa self-balancing double-wheeled electrical scooter, for the axle sleeveof the fastening component that fastens the axle to the scooter body, aninner bore of the axle sleeve has unequal diameters at its two ends,with the diameter at the end near the wheel larger than that of the endaway from the wheel, the line connecting the peripheries of the two endshas an angle of 1° to 3° relative to a horizontal plane.

According to a sixth aspect of the present invention, the embodiments ofthe present invention disclose a handle for a self-balancing electricalscooter which has simple structure with foldable handle bars to savespace, the handle can be folded in a non-riding state for convenience ofcarrying around, wherein, the handle comprises an upper handle bar, alower handle bar, a foldable mechanism between the upper and lowerhandle bars, and a hand-held part, the upper handle bar and the lowerhandle bar are connected in a foldable manner by the foldable mechanism,the hand-held part is mechanically fixed to the upper handle bar.

In the handle for a self-balancing electrical scooter, the hand-heldpart has a scooter body display device and/or a scooter body controldevice arranged between two handle levers.

In the handle for a self-balancing electrical scooter, the scooter bodycontrol device arranged between the two handle levers comprises ascooter body Bluetooth control unit, a scooter remote upgrade controlunit, and a scooter power source remote switch unit.

In the handle for a self-balancing electrical scooter, the upper handlebar and the lower handle bar are connected in a fixed foldable manner bythe foldable mechanism.

In the handle for a self-balancing electrical scooter, the foldablemechanism comprises a foldable member, a fastener for limiting the foldposition and a sealing member. Wherein, the foldable member is a hingewhich comprises an upper hinge piece, a lower hinge piece and a rotationshaft for connecting the upper and lower hinge pieces, the upper hingepiece and the lower hinge piece are respectively fixed on the upperhandle bar and the lower handle bar. Thus the upper handle bar and thelower handle bar can be connected or folded together by opening andclosing of the hinge. Wherein, the connecting fastener is arranged forconnecting the upper handle bar and the lower handle bar in a fixedmanner, and comprises a buckle hook, a buckle ring, a buckle bracket anda buckle locking member, with the buckle hook fixed on one of the upperand lower handle bars, and with the buckle ring, the buckle bracket andthe buckle locking member fixed on the other of the upper and lowerhandle bars, the buckle ring is able to be buckled onto the buckle hookso as to form fixed connection between the upper and lower handle bars,the buckle ring is mechanically connected to the buckle bracket in arotatable manner, and the buckle bracket is locked by the buckle lockingmember.

In the handle for a self-balancing electrical scooter, the sealingmember is made of elastic waterproof material and is fixed in a sealedmanner around a connecting interface between the upper handle bar andthe lower handle bar, for allowing the interface connection between theupper handle bar and the lower handle bar to be a seal connection withwaterproof effect. In the meantime, by using the elastic material, thehand-held part has certain elastic recovery buffer effect for a ridertravelling on a bumpy road, which effectively reduces bumpy feeling forthe hands of the rider.

In the handle for a self-balancing electrical scooter, the sealingmember is made of rubber or silicone, with a cable hole provided thereonfor a transmission cable to pass through, so that a transmission cablefor connecting the scooter body display device and/or the scooter bodycontrol device arranged between the two handle levers to a power sourceas well as a control unit in the chassis.

In the handle for a self-balancing electrical scooter, the transmissioncable is arranged in a foldable tube that is clamped in the cable hole,and sealing is formed between the cable hole and an outer wall of thefoldable tube. On one hand, the transmission cable is effectivelyprevented from being exposed; on the other hand, the foldable tube canstretch along with folding of the upper handle bar and the lower handlebar, so that the folding of the upper handle bar and the lower handlebar would not damage the transmission cable.

In the handle for a self-balancing electrical scooter, the upper handlebar and the lower handle bar are respectively provided with a groove, adecorative LED lamp is further received in the groove, and transparentsilicone is provided on the outside for encapsulating the LED lampinside the groove.

In the handle for a self-balancing electrical scooter, for easy ofassembling, the handle is provided with a power source port and a signaltransmission control interface port which are respectively connected ina pluggable manner to a corresponding power source port and acorresponding signal transmission control interface port extending fromwithin the chassis.

In the handle for a self-balancing electrical scooter, the handle isfurther provided with a handle base connected to the chassis directly orindirectly, the power source port and signal transmission controlinterface port of the handle are connected to corresponding ports of thehandle base in a pluggable manner, and the handle and the handle baseare further mechanically connected in a fixed manner by screw bolts.

In the handle for a self-balancing electrical scooter, the upper handlebar and the hand-held part are connected in a pluggable manner andfastened together by screw bolts.

According to a seventh aspect of the present invention, the embodimentsof the present invention disclose a connection structure between a motorshaft of a hub motor and a wheel of a self-balancing double-wheeledelectrical scooter, which has simple structure and is easy to assemble,and can bring steady travel conditions for the scooter. The connectionbetween the motor shaft and the wheel in the present invention does notrequire any extra component, and it only requires putting the motorshaft into a wheel bracket to complete the assembly. A motor bracket ofthe wheel is connected to a stator of the hub motor, the motor shaft ofthe wheel is fixed at a center of the motor bracket of the wheel andextending inside a central hole of the motor bracket, with the diameterof the central hole of the motor bracket for fixing the motor shaftsmaller than the diameter of the motor shaft, the motor shaft is pressedinto the central hole of the motor bracket to be stuck in the centralhole of the motor bracket, without any possibility of displacementbetween the shaft and the bracket hole. Fastening components such asscrew bolts is not required to be added onto the shaft, and no weldingis needed between the motor shaft and the bracket, as the welding wouldcause the motor shaft and the bracket to be non-detachable during latermaintenance of the scooter.

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, thedifference value obtained by subtracting a minimum diameter of the motorshaft fixed in the central hole of the motor bracket from a maximumdiameter of the central hole of the motor bracket is an interferencevalue Y_(min) corresponding to the loosest fitting state of the motorshaft and the central hole, the difference value obtained by subtractinga maximum diameter of the motor shaft fixed in the central hole of themotor bracket from a minimum diameter of the central hole of the motorbracket is an interference value Y_(max) corresponding to the tightestfitting state of the motor shaft and the central hole, and Y_(min)≤−0.01mm, Y_(max)≥−0.5 mm, Y_(min)≥Y_(max).

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, the motorshaft of the wheel is fixed in the central hole of the motor bracket ofthe wheel, the motor shaft is provided with a bore which communicateswith a corresponding bore on the inner wall of the central hole of themotor bracket, and a pin is inserted within the bore. With the pininserted into the bore, the shaft and the bracket are further fastened,without any displacement in the left-right direction.

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, the wheelis further provided with wheel lateral covers on both lateral sides, thewheel lateral covers are mechanically connected to the motor shaftthrough bearings, and interference-fit connections are formed betweenthe wheel lateral covers and the bearings as well as between thebearings and the motor shaft, with Y_(min)≤−0.01 mm, Y_(max)≥−0.5 mm,Y_(min)≥Y_(max). This is more convenient as compared to othertechniques, and the structure is simplified, with a more aestheticappearance.

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, the motorshaft is further provided with a cable positioning hole foraccommodating a connecting cable between the hub motor and the scooterbody, the cable positioning hole is arranged at the connecting positionof the motor shaft and one of the bearings, for allowing the connectingcable between the hub motor and the scooter body to pass through.

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, forallowing the connecting cable to more easily pass through, the diameterof the cable positioning hole is larger than the outer diameter of theconnecting cable between the hub motor and the scooter body, and issmaller than or equal to 1.5 times the outer diameter of the connectingcable between the hub motor and the scooter body.

In the connection structure between a motor shaft of a hub motor and awheel of a self-balancing double-wheeled electrical scooter, forallowing the connecting cable to easily extend in or extend out, thelength of the cable positioning hole is larger than the bearing widthplus 2 times the outer diameter of the connecting cable between the hubmotor and the scooter body, the bearing is disposed upon the cablepositioning hole, with two ends of the cable positioning hole arrangedon the inner side and outer side of the bearing.

According to an eighth aspect of the present invention, the embodimentsof the present invention disclose a foldable mechanism of a foldablehandle of a self-balancing electrical scooter, wherein, the handle baris made into two or more sections by using the foldable mechanism of thehandle, thereby reducing the storage space required by theself-balancing electrical scooter, and the respective sections of handlebars can be connected together by the foldable mechanism, the foldablemechanism comprises a foldable member, a connecting fastener and asealing member, the foldable member switches the handle between a foldedposition and a connected position, the connecting fastener is arrangedto fasten the two or more sections of handle bars into the connectedposition, the sealing member is arranged to seal a connecting interfacebetween an upper handle bar and a lower handle bar.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the foldable member can be selected to be a hingewhich comprises an upper hinge piece, a lower hinge piece and a rotationshaft for connecting the upper and lower hinge pieces, the upper hingepiece and the lower hinge piece are respectively fixed on the upperhandle bar and the lower handle bar. Thus the upper handle bar and thelower handle bar can be connected or folded together by opening andclosing of the hinge.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the connecting fastener is arranged for connectingthe upper handle bar and the lower handle bar in a fixed manner, andcomprises a buckle hook, a buckle ring and a buckle bracket, with thebuckle hook fixed on one of the upper and lower handle bars, and withthe buckle ring and the buckle bracket fixed on the other of the upperand lower handle bars, the buckle ring is able to be buckled onto thebuckle hook so as to form fixed connection between the upper and lowerhandle bars, the buckle ring is mechanically connected to the bucklebracket in a rotatable manner.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the buckle bracket comprises a buckle upper casingand a buckle lower casing, the buckle lower casing is fixed on thehandle, the buckle upper casing is connected on the buckle lower casingin a rotatable manner by means of a buckle rotation shaft, the bucklering is connected on the buckle upper casing in a rotatable manner, whenthe buckle upper casing is opened, the buckle ring is at an enteringposition corresponding to the buckle hook, when the buckle upper casingis then closed, the buckle ring becomes connected to the buckle hook ina fixed manner, and when the buckle upper casing is opened again, thebuckle ring slides off from the buckle hook.

The foldable mechanism of a foldable handle of a self-balancingelectrical scooter further comprises a buckle locking member for lockingthe buckle bracket by keeping the buckle upper casing and the bucklelower casing locked in a closed state, so as to prevent the buckle ringfrom sliding off from the buckle hook.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the buckle locking member comprises a spring, abuckle locking piece and a buckle locking hook, the buckle locking pieceis set on the buckle upper casing, the spring is set on the bucklelocking piece, the buckle locking hook is set on the buckle lowercasing, and the buckle upper casing is locked onto the buckle lowercasing by means of the buckle locking piece being hooked onto the bucklelocking hook.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the buckle locking piece comprises a buckle lockingpiece pressing portion, a buckle locking piece aperture and bucklelocking piece horns, the spring comprises two springs arranged inparallel, the buckle locking piece is transversely inserted in thebuckle upper casing, with the buckle locking piece pressing portionplaced outside one lateral side of the buckle upper casing, and with thebuckle locking piece horns extending out from the other lateral side ofthe buckle upper casing, the springs are set on the buckle locking piecehorns inside the buckle upper casing, with one end of the spring pushedagainst the starting end of the buckle locking piece horn, and with theother end of the spring pushed against an inner lateral wall of thebuckle upper casing, the buckle locking piece aperture is provided witha protrusion for restraining the buckle locking piece horns fromcompletely entering the buckle upper casing, this protrusion abuts aninner side of the buckle upper casing opposite the buckle locking piecepressing portion when the springs stretches to a maximum extent withinthe buckle locking member, the buckle locking hook hooks itself onto anedge of the buckle locking piece aperture when the buckle upper casingis closed, and when the buckle locking piece pressing portion ispressed, displacement of the buckle locking piece aperture occurs,causing the buckle locking hook to break away from the edge of thebuckle locking piece aperture and enter the buckle locking pieceaperture, so that the buckle upper casing becomes free to be opened.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the sealing member is made of elastic waterproofmaterial and is fixed in a sealed manner around a connecting interfacebetween the upper handle bar and the lower handle bar, for allowing theinterface connection between the upper handle bar and the lower handlebar to be a seal connection with waterproof effect. In the meantime, byusing the elastic material, the hand-held part has certain elasticrecovery buffer effect for a rider travelling on a bumpy road, whicheffectively reduces bumpy feeling for the hands of the rider.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the sealing member is made of rubber or silicone,with a cable hole provided thereon for a transmission cable to passthrough, so that a transmission cable for connecting the scooter bodydisplay device and/or the scooter body control device arranged betweentwo handle levers to a power source as well as a control unit in thechassis.

In the foldable mechanism of a foldable handle of a self-balancingelectrical scooter, the transmission cable is arranged in a foldabletube that is clamped in the cable hole on the sealing member of thefoldable mechanism, and sealing is formed between the cable hole and anouter wall of the foldable tube. On one hand, the transmission cable iseffectively prevented from being exposed; on the other hand, thefoldable tube can stretch along with folding of the upper handle bar andthe lower handle bar, so that the folding of the upper handle bar andthe lower handle bar would not damage the transmission cable.

BRIEF DESCRIPTION OF THE DRAWINGS

The characteristics and advantages of the present invention can beunderstood more clearly by referring to the appended drawings, which isillustrative and not to be interpreted as any restriction to the presentinvention. In the drawings:

FIG. 1 is a schematic diagram of an assembly for controlling a traveldirection of a self-balancing double-wheeled electrical scooteraccording to an embodiment of the present invention;

FIG. 2 is a sectional view of a device for collecting information ofchange of handle position that is set on the assembly for controlling atravel direction of a self-balancing double-wheeled electrical scooter;

FIG. 3 is an exploded view of a device for collecting information ofchange of handle position that is set on an assembly for controlling atravel direction of a self-balancing double-wheeled electrical scooter;

FIG. 4 is a top view after mounting of an assembly for turning on andturning off operation of a self-balancing double-wheeled electricalscooter according to an embodiment of the present invention;

FIG. 5 is a sectional view of an assembly for turning on and turning offoperation of a self-balancing double-wheeled electrical scooteraccording to an embodiment of the present invention;

FIG. 6 is an exploded view of respective components of a fixedconnection structure between a wheel and a scooter body of an electricalscooter;

FIG. 7 is a sectional view of a fixed connection structure between awheel and a scooter body of an electrical scooter;

FIG. 8 is an exploded view of an upper handle bar, a lower handle barand a foldable mechanism according to an embodiment of the presentinvention;

FIG. 9 is a schematic diagram of the foldable mechanism according to anembodiment of the present invention;

FIG. 10 is an exploded view of respective components of a foldablehandle according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of foldable handle bars with LED lampsaccording to an embodiment of the present invention;

FIG. 12 is a sectional view of a connection structure between a motorshaft of a hub motor and a wheel of a self-balancing double-wheeledelectrical scooter;

FIG. 13 is an exploded view of a connection structure between a motorshaft of a hub motor and a wheel of a self-balancing double-wheeledelectrical scooter;

FIG. 14 is a schematic diagram of a foldable mechanism according to anembodiment of the present invention;

FIG. 15 is an exploded view of a foldable mechanism according to anembodiment of the present invention.

Wherein, 101 represents a stator, 102 represents a position limitingcomponent between the stator and the rotor, 103 represents a limitingcover, 104 represents screw bolts for fastening the limiting cover, 105represents a limiting pin, 106 represents a handle base, 107 representsa scooter body, 108 represents screw bolts for fastening the signalcapturing and processing unit onto the stator, 109 represents a pedestalof the signal capturing and processing unit, 110 represents bolts forfastening the stator onto the scooter body, 111 represents a resilientrecoverable unit, 112 represents a rotor, 113 represents a magnetbracket, 114 represents a magnet, 115 represents a linear Hall sensor,201 represents a foot pedal, 202 represents a chassis, 203 represents aresilient unit, 204 represents a signal blocking unit, 205 represents anoptical signal emitter, 206 represents an optical signal receiver, 207represents a signal transmission port, 208 represents a circuit board,301 represents a split pin, 302 represents a scooter body, 303represents a axle sleeve, 304 represents a wheel, 305 represents anadjusting steel sheet, 306 represents a crescent unit, 307 represents aflange nut, 308 represents a groove on the surface of the axle sleeve,309 represents a wheel axle, 401 represents an upper handle bar, 402represents a hinge, 403 represents screw bolts for fastening the hingeonto the upper handle bar and the lower handle bar, 404 represents asealing member, 405 represents a buckle bracket, 406 represents screwbolts for fastening the buckle bracket onto the handle, 407 represents alower handle bar, 408 represents a buckle locking member, 409 representsa buckle ring, 410 represents a buckle hook, 411 represents screw boltsfor fastening the buckle hook onto the handle bar, 412 represents ahand-held part, 413 represents a handle lever, 414 represents a powersource and signal transmission control interface port, 415 represents ahandle base, 416 represents a screw bolt for fastening the handle ontothe handle base, 417 represents a portion of the hand-held partpluggable to the handle, 418 represents a portion of the base pluggableto the handle, 419 represents a portion of the handle pluggable to thehand-held part, 420 represents a portion of the handle pluggable to thebase, 421 represents a groove on the handle bar, 422 represents andecorative LED lamp mounted on the groove wall of the handle bar, 423represents transparent silicone coated outside the decorative LED lampin the groove of the handle bar, 501 represents a screw bolt, 502represents a motor lateral cover, 503 represents a motor bracket, 504represents a bearing, 505 represents a bearing sleeve, 506 represents apin, 507 represents a motor shaft, 508 represents a cable positioninghole, 509 represents a connecting cable, 510 represents a wheel hub, 511represents a magnetic steel sheet, 601 represents an upper hinge piece,602 represents a lower hinge piece, 603 represents screw bolts forfastening the hinge, 604 represents a rotation shaft for connecting theupper and lower hinge pieces, 605 represents a handle bar, 606represents screw bolts for fastening the buckle hook, 607 represents abuckle hook, 608 represents a buckle ring, 609 represents a sealingmember, 610 represents a buckle rotation shaft, 611 represents fasteningscrew bolts for fastening the buckle lower casing, 612 represents abuckle locking piece pressing portion, 613 represents a spring set onthe buckle locking piece, 614 represents a buckle upper casing, 615represents a buckle lower casing, 616 represents a buckle locking piece.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, the embodiments of the present invention are described indetail with reference to the appended drawings.

Embodiment 1

A resilient recoverable component provided between a scooter body and ahandle is utilized to form an assembly for controlling a traveldirection of a self-balancing double-wheeled electrical scooter. Thehandle is drives the resilient recoverable component to control thetravel direction of the scooter. The resilient recoverable componentcomprises a stator, a rotor and a resilient recoverable unit, the rotoris disposed inside the stator, the rotor is mechanically connected tothe handle in a fixed manner, the stator is mechanically connected tothe scooter body in a fixed manner, the inner surface of the stator andthe outer surface of the rotor are provided with dented patterns, thestator and the rotor are connected in a resilient manner by means of arubber unit, as the resilient recoverable unit, injection molded intheir gap. The stator and the rotor are connected integrally via theresilient recoverable unit. The rotor driven by an external forcerotates relative to its initial position, causing the resilientrecoverable unit to deform, and when the external driving force exertedon the rotor weakens or disappears, the elastic recovery force of theresilient recoverable unit causes the rotor to move towards its initialposition or return to its initial position. A position limitingcomponent is provided between the stator and the rotor, for preventingall movements of the rotor relative to the stator other than rotation. Alimiting pin is mechanically fixed to the rotor, a limiting cover isprovided on the stator, a limiting hole is provided on the limitingcover, and, driven by the rotor, the limiting pin is able to rotatewithin an angle range from −30° to 30° in the limiting hole on thelimiting cover.

Embodiment 2

A device for collecting information of change of handle position is seton the resilient recoverable component between the scooter body and thehandle. The device for collecting information of change of handleposition comprises a signal capturing and processing unit and a signalemitting unit. The signal emitting unit is a pair of magnets that arearranged in a central symmetric manner and are directly provided on thestator which is mechanically connected to the handle in a fixed mannerdirectly, the symmetric center of the magnets is a rotation center ofthe rotor. The signal capturing and processing unit is a linear Hallsensor is provided at a location corresponding to the symmetric centerof the magnets and on a stator cover of the stator which is mechanicallyconnected to the scooter body in a fixed manner directly. The rotationof the rotor relative to the stator drives the signal emitting unit torotate relative to the signal capturing and processing unit, the signalemitting unit emits different signals associated with its differentpositions relative to the signal capturing and processing unit duringits rotation process, the signal capturing and processing unit capturesand processes different signals and then transmits correspondinginformation to a control unit, the control unit processes and transmitscorresponding information to motors, and accordingly the motors drivethe two wheels differently.

Embodiment 3

A signal sensing device, a resilient unit and a signal blocking unitconstitute an assembly for turning on and turning off operation of aself-balancing double-wheeled electrical scooter. The signal sensingdevice is set in a chassis of the self-balancing double-wheeledelectrical scooter under a foot pedal, the resilient unit is arrangedabove the signal sensing device and directly facing the signal sensingdevice, the signal blocking unit is connected to the resilient unit in afixed manner and is arranged under the resilient unit andperpendicularly corresponding to a signal transmission path of thesignal sensing device. The signal sensing device is set in the chassisof the self-balancing double-wheeled electrical scooter, the foot pedalon the chassis is provided with an aperture which is correspondinglylocated above the signal transmission path of the signal sensing device,the resilient unit is arranged above the aperture of the foot pedal in aprotruding manner, the signal blocking unit on the resilient unit isarranged to extend through the aperture, when the resilient unit isdeformed downwards by an external force, the signal blocking unit blocksthe sensing signal of the signal sensing device. The signal sensingdevice comprises a circuit board, as well as an optical signal emitter,an optical signal receiver, a signal transmission port, acurrent-limiting resistor, a filter capacitor, a load resistor which areall mounted on the circuit board. After electrical power is filtered bythe filter capacitor and current-limited by the current-limitingresistor and then fed to the optical signal emitter, the optical signalemitter sends a sensing signal in the form of light to the opticalsignal receiver, the optical signal receiver converts the receivedoptical signal into electrical current signal which is then convertedinto voltage signal via the load resistor and transmitted to the signaltransmission port and after that sent to a controller of theself-balancing double-wheeled electrical scooter, and when thecontroller receives the voltage signal, the operation of theself-balancing double-wheeled electrical scooter is controlled at ashut-down state. In the process of the optical signal emittertransmitting a sensing signal in the form of light to the optical signalreceiver, if the emitted signal gets blocked by the signal blockingunit, the optical signal receiver is unable to receive any correspondingsignal, so that the controller does not receive any correspondingvoltage signal, and thus the operation of the self-balancingdouble-wheeled electrical scooter is controlled at an actuated state.

Embodiment 4

A fixed connection structure between a wheel and a scooter body of aself-balancing double-wheeled electrical scooter comprises a flange nut,a crescent unit, an adjusting steel sheet and an axle sleeve. The axlesleeve is made of material harder than the scooter body, and an outersurface of the axle sleeve is rough or has dented portions thereon. Aninner bore of the axle sleeve has unequal diameters at its two ends,with the diameter at the end near the wheel larger than that of the endaway from the wheel, and the line connecting the peripheries of the twoends has an angle of 1° to 3° relative to a horizontal plane. Thescooter body is fixed to the axle sleeve by pressure casting. In thecrescent unit of the fastening component that fastens the wheel axle tothe scooter body, the surface opposite a concave portion of a crescentpiece thereof is a slanted surface which skews towards the axle on aside near the wheel, and the surface with the screw hole on the scooterbody also has slanted portions. When the flange nut pushes the crescentpieces to screw toward the wheel, because the surface with the screwhole has slanted portions, the screw hole becomes smaller and smaller.The adjusting steel sheet is fitted between the crescent unit and thescooter body. The corresponding surface on the scooter body skewstowards the axle on a side near the wheel in a manner corresponding tothat of the crescent piece. Therefore, during a continuous screwing-inprocess, the contact between the flange nut and the crescent unit,between the crescent unit and the axle, between the crescent unit andthe adjusting steel sheet, as well as between the adjusting steel sheetand the scooter body would become more and more firm. In the fasteningcomponent that fastens the wheel axle to the scooter body, the axle isprovided with a hole at a position behind the flange nut and adjacentthe flange nut, the fastening component further comprises a split pinwhich is set in the hole of the axle. The split pin is configured toprevent the flange nut from being screwed out. By further providing asplit pin on the axle to secure the flange nut, the flange nut isprevented from loosening, and screwing out of the flange nut iseffectively prevented.

Embodiment 5

A foldable handle comprises an upper handle bar, a lower handle bar, afoldable mechanism between the upper and lower handle bars, and ahand-held part, the upper handle bar and the lower handle bar areconnected in a foldable manner by the foldable mechanism. The foldablemechanism comprises a foldable member, a connecting fastener and asealing member. The foldable member a hinge which comprises an upperhinge piece, a lower hinge piece and a rotation shaft for connecting theupper and lower hinge pieces, the upper hinge piece and the lower hingepiece are respectively fixed on the upper handle bar and the lowerhandle bar. The connecting fastener is arranged for connecting the upperhandle bar and the lower handle bar in a fixed manner, and comprises abuckle hook, a buckle ring, a buckle bracket and a buckle lockingmember, with the buckle hook fixed on one of the upper and lower handlebars, and with the buckle ring, the buckle bracket and the bucklelocking member fixed on the other of the upper and lower handle bars,the buckle ring is able to be buckled onto the buckle hook so as to formfixed connection between the upper and lower handle bars, the bucklering is mechanically connected to the buckle bracket in a rotatablemanner, and the buckle bracket is locked by the buckle locking member.The sealing member is made of rubber and is fixed in a sealed manneraround a connecting interface between the upper handle bar and the lowerhandle bar. The sealing member is made of rubber or silicone, with acable hole provided thereon for a transmission cable to pass through.The transmission cable is arranged in a foldable tube that is clamped inthe cable hole, and sealing is formed between the cable hole and anouter wall of the foldable tube. The hand-held part is mechanicallyfixed to the upper handle bar, and comprises two handle levers as wellas a scooter body display device and/or a scooter body control devicearranged between the two handle levers, the scooter body control devicecomprises a scooter body Bluetooth control unit, a scooter remoteupgrade control unit, and a scooter power source remote switch unit. Theupper handle bar and the lower handle bar are respectively provided witha groove, a decorative LED lamp is further received in the groove, andtransparent silicone is provided on the outside for encapsulating theLED lamp inside the groove. The handle is provided with a power sourceport and a signal transmission control interface port, the handle isfurther provided with a handle base connected to the scooter body, thepower source port and signal transmission control interface port of thehandle are connected to corresponding ports of the handle base in apluggable manner, and the handle and the handle base are furthermechanically connected in a fixed manner by screw bolts.

Embodiment 6

The difference value between the diameter of a motor shaft of a hubmotor and the diameter of a central hole of a wheel motor bracket in aself-balancing double-wheeled electrical scooter is 0.3 mm. The motorshaft is fixed at a center of the motor bracket of the wheel andextending inside the central hole of the motor bracket, with thediameter of the central hole of the motor bracket smaller than thediameter of the motor shaft, the motor shaft is pressed into the centralhole of the motor bracket. The wheel motor shaft is provided with a borewhich communicates with a corresponding bore on the inner wall of thecentral hole of the wheel motor bracket for fixing the motor shaft, anda pin is inserted within the bore. Wheel lateral covers are mechanicallyconnected to the motor shaft through bearings, and interference-fitconnections are formed between the wheel lateral covers and the bearingsas well as between the bearings and the motor shaft, The diameterinterference values between the bearings and the wheel lateral covers aswell as the diameter interference values between the motor shaft and thebearings are all controlled at about 0.3 mm. The motor shaft is furtherprovided with a cable positioning hole for accommodating a connectingcable between the hub motor and the scooter body, the cable positioninghole is arranged at the connecting position of the motor shaft and oneof the bearings. The diameter of the cable positioning hole is largerthan the outer diameter of the connecting cable between the hub motorand the scooter body, and is smaller than or equal to 1.5 times theouter diameter of the connecting cable between the hub motor and thescooter body. The length of the cable positioning hole is larger thanthe bearing width plus 2 times the outer diameter of the connectingcable between the hub motor and the scooter body, the bearing isdisposed upon the cable positioning hole, with two ends of the cablepositioning hole arranged on the inner side and outer side of thebearing.

Embodiment 7

A foldable member, a connecting fastener and a sealing member constitutea foldable mechanism of a foldable handle of a self-balancing electricalscooter. The foldable member is a hinge which comprises an upper hingepiece, a lower hinge piece and a rotation shaft for connecting the upperand lower hinge pieces, the upper hinge piece and the lower hinge pieceare respectively fixed on the upper handle bar and the lower handle bar,for switching the handle between a folded position and a connectedposition. The connecting fastener comprises a buckle hook, a bucklering, a buckle bracket and a buckle locking member, with the buckle hookfixed on one of the upper and lower handle bars, and with the bucklering, the buckle bracket and the buckle locking member fixed on theother of the upper and lower handle bars, the buckle ring is able to bebuckled onto the buckle hook so as to form fixed connection between theupper and lower handle bars, the buckle ring is mechanically connectedto the buckle bracket in a rotatable manner, and the buckle bracket islocked by the buckle locking member, for fastening respective sectionsof the handle into the connected position. The sealing member isarranged to seal a connecting interface between an upper handle bar anda lower handle bar. The buckle bracket comprises a buckle upper casingand a buckle lower casing, the buckle lower casing is fixed on thehandle, the buckle upper casing is connected on the buckle lower casingin a rotatable manner by means of a buckle rotation shaft, the bucklering is connected on the buckle upper casing in a rotatable manner, whenthe buckle upper casing is opened, the buckle ring is at an enteringposition corresponding to the buckle hook, when the buckle upper casingis then closed, the buckle ring becomes connected to the buckle hook ina fixed manner, and when the buckle upper casing is opened again, thebuckle ring slides off from the buckle hook. The buckle locking membercomprises a spring, a buckle locking piece and a buckle locking hook,the buckle locking piece is set on the buckle upper casing, the springis set on the buckle locking piece, the buckle locking hook is set onthe buckle lower casing, and the buckle upper casing is locked onto thebuckle lower casing by means of the buckle locking piece being hookedonto the buckle locking hook. The buckle locking piece comprises abuckle locking piece pressing portion, a buckle locking piece apertureand buckle locking piece horns, the spring comprises two springsarranged in parallel, the buckle locking piece is transversely insertedin the buckle upper casing, with the buckle locking piece pressingportion placed outside one lateral side of the buckle upper casing, andwith the buckle locking piece horns extending out from the other lateralside of the buckle upper casing, the springs are set on the bucklelocking piece horns inside the buckle upper casing, with one end of thespring pushed against the starting end of the buckle locking piece horn,and with the other end of the spring pushed against an inner lateralwall of the buckle upper casing, the buckle locking piece aperture isprovided with a protrusion for restraining the buckle locking piecehorns from completely entering the buckle upper casing, this protrusionabuts an inner side of the buckle upper casing opposite the bucklelocking piece pressing portion when the springs stretches to a maximumextent within the buckle locking member, the buckle locking hook hooksitself onto an edge of the buckle locking piece aperture when the buckleupper casing is closed, and when the buckle locking piece pressingportion is pressed, displacement of the buckle locking piece apertureoccurs, causing the buckle locking hook to break away from the edge ofthe buckle locking piece aperture and enter the buckle locking pieceaperture, so that the buckle upper casing becomes free to be opened. Thesealing member is made of elastic waterproof material such as rubber,with a cable hole provided thereon for a transmission cable to passthrough. The transmission cable is arranged in a foldable tube that isclamped in the cable hole, and sealing is formed between the cable holeand an outer wall of the foldable tube.

Although the embodiments of the present invention has been described inconjunction with the appended drawings, those skilled in the art canmake various changes and modifications without deviating form theconcept and scope of the present invention, and such changes andmodifications are all intended to be embraced within the scope definedby the appended claims.

The invention claimed is:
 1. An assembly for controlling a traveldirection of a self-balancing double-wheeled electrical scooter,characterized in that, the travel direction of the self-balancingdouble-wheeled electrical scooter is controlled via a handle on ascooter body, a resilient recoverable component is provided between thescooter body and the handle, the handle is adapted for driving theresilient recoverable component to control the travel direction of thescooter, the resilient recoverable component comprises a stator, a rotorand a resilient recoverable unit, the rotor is mechanically connected tothe handle in a fixed manner directly or indirectly, the stator ismechanically connected to the scooter body in a fixed manner directly orindirectly, the stator and the rotor are connected by the resilientrecoverable unit in a resilient manner, the resilient recoverablecomponent between the scooter body and the handle further comprises anangle limiting device which limits rotation of the rotor to a certainangle range, the angle limiting device comprises a limiting cover and alimiting pin, the limiting cover is mechanically connected to the statorin a fixed manner directly or indirectly, a limiting hole is provided onthe limiting cover, the limiting pin is mechanically connected to therotor in a fixed manner directly or indirectly, and the rotation of therotor causes the limiting pin to rotate within a certain angle rangeinside the limiting hole on the limiting cover.
 2. The assembly forcontrolling a travel direction of the self-balancing double-wheeledelectrical scooter according to claim 1, characterized in that, thestator is disposed inside the rotor.
 3. The assembly for controlling atravel direction of the self-balancing double-wheeled electrical scooteraccording to claim 1, characterized in that, the rotor is disposedinside the stator.
 4. The assembly for controlling a travel direction ofthe self-balancing double-wheeled electrical scooter according to claim1, characterized in that, the resilient recoverable unit is filled inthe gap between the stator and the rotor so that the stator and therotor are connected integrally via the resilient recoverable unit, therotor driven by an external force rotates relative to its initialposition, causing the resilient recoverable unit to deform, and when theexternal driving force exerted on the rotor weakens or disappears, theelastic recovery force of the resilient recoverable unit causes therotor to move towards its initial position or return to its initialposition.
 5. The assembly for controlling a travel direction of theself-balancing double-wheeled electrical scooter according to claim 1,characterized in that, a position limiting component is provided betweenthe stator and the rotor, for preventing all movements of the rotorrelative to the stator other than rotation.
 6. The assembly forcontrolling a travel direction of the self-balancing double-wheeledelectrical scooter according to claim 1, characterized in that, thestator and the rotor are connected in a resilient manner via theresilient recoverable unit, and the resilient recoverable unit is arubber unit or a silicone unit that is injection molded between thestator and the rotor.
 7. The assembly for controlling a travel directionof the self-balancing double-wheeled electrical scooter according toclaim 6, characterized in that, the contact surface between the statorand the resilient recoverable unit or between the rotor and theresilient recoverable unit is a rough surface or a dented patternedsurface.
 8. The assembly for controlling a travel direction of theself-balancing double-wheeled electrical scooter according to claim 1,characterized in that, the handle and the rotor are mechanicallyconnected in a fixed manner via a handle base, the limiting pin is fixedon the handle base, and the handle, when driven by an external force, isadapted for driving the handle base and the limiting pin on the handlebase to rotate within a certain angle range limited by the limiting holeon the limiting cover.
 9. The assembly for controlling a traveldirection of the self-balancing double-wheeled electrical scooteraccording to claim 1, characterized in that, said angle range is from−30° to 30°.
 10. The assembly for controlling a travel direction of theself-balancing double-wheeled electrical scooter according to claim 1,wherein, the assembly is provided with an information-collecting devicefor collecting information of change of handle position.
 11. Theassembly for controlling a travel direction of the self-balancingdouble-wheeled electrical scooter according to claim 10, wherein, theinformation-collecting device comprises a signal capturing andprocessing unit and a signal emitting unit.
 12. The assembly forcontrolling a travel direction of the self-balancing double-wheeledelectrical scooter according to claim 11, characterized in that, thesignal emitting unit is directly or indirectly fixed to the rotor whichis mechanically connected to the handle in a fixed manner directly orindirectly, the signal capturing and processing unit is directly orindirectly fixed to the stator which is mechanically connected to thescooter body in a fixed manner directly or indirectly, the rotation ofthe rotor relative to the stator drives the signal emitting unit torotate relative to the signal capturing and processing unit.
 13. Theassembly for controlling a travel direction of the self-balancingdouble-wheeled electrical scooter according to claim 11, characterizedin that, the signal emitting unit is directly or indirectly fixed to thestator which is mechanically connected to the scooter body in a fixedmanner directly or indirectly, the signal capturing and processing unitis directly or indirectly fixed to the rotor which is mechanicallyconnected to the handle in a fixed manner directly or indirectly, therotation of the rotor relative to the stator drives the signal capturingand processing unit to rotate relative to the signal emitting unit. 14.The assembly for controlling a travel direction of the self-balancingdouble-wheeled electrical scooter according to claim 11, characterizedin that, the signal emitting unit is a magnet, and the signal capturingand processing unit is a linear Hall sensor.
 15. The assembly forcontrolling a travel direction of the self-balancing double-wheeledelectrical scooter according to claim 14, characterized in that, themagnet comprises a pair of magnets which are arranged in a centralsymmetric manner and are directly or indirectly fixed to the stator orthe rotor, with a center thereof being a rotation center, and the linearHall sensor is fixed at a location corresponding to the center of themagnets.